Oil burner



June 12, 192s.

J. N. MACRAE OIL BURNER Filed Sept. 2, 1927 Q Q N M.

lNVENTOR jm@ m,

/r Y y ML/TIRN Ys Patented J une 12, 1928.

UNITED STATES PATENT OFFICE.r

JAMES N. IACRAE, 0F STAIFORD, CONNECTICUT, ASSIGN OR T0 PETROLEUM HEATA, POWER COMPANY, 0F NEW YORK, N. Y.,

A CORPORATION 0F DELAWARE.

OIL BURNER.

Application led September 2, 1927. Serial No, 217,043.

This invention relates to an improvement in oil burners of the typeknown as mechanical burners as distinguished from burners of thecentrifugal or rotary type in which a rotating cup is employed foratomizing the fuel, and has for one of its objects the provision of anoil burner of the mechanical type in which carbonizing of oil in thesame is eliminated or reduced to a point where no longer detrimental tothe operation of the apparatus.

In the type of burner to which the present invention relates, it iscustomary to provide a burner body on the discharge end of which ismounted a cap through which the oil is discharged in a finely atomizedcondition. Such burners are inherently unsatisfactory for the reasonthat when the burner is shut off-not operating-the oil remainin in the"burner becomes carbonized due to t e heat radiating from the furnace towhich the burner is applied and blocks or plugs the oil passages so asto render the burner inoperative.

A further object of my invention is to provide a burner of the t peabove briefiy outlined which will be sel -draining so that all oilremaining in the burner head when the burner is. shut olf willv bedrained back toward the supply to eliminate all possibility ofcarbonizatlon of the residue oils and blocking of the oil assages. Infurther explanation it might he said that in oil burning apparatus ofthe type to which this invention relates oil is su plied from a.y feedtank which is under a ew ounces of pressure. When oil is to be fed tothe burner the feed tank is vented to permit the ressure therein to dropto atmospheric an the ow of oil to the burner to cease.

In the accompanying drawings I have illustrated one embodiment of myinvention,

Fig. 1 showing the same in part sectional elevation;

Fig. 2 being a section-on the line 2-2 of Fi. 1;

ig. 3 being a section on the line 3 3 of Fig. 1; and

ig. 4 being an end vlew of the burner plunger.

Referrin to the drawings in detail 1 designates theurner body which itwill e seen is mounted at an incline to the horizontal. 2 desi ates theburner body couplin adaptada1 to be connected to a source ofoi underpressure, While 3 designates a strainer and 4 a strainer body nut.

Oil under pressure is supplied to the burner body 1 through the openin 5in the burner body coupling 2, as will he understood, passes through thestrainer screen 6 and is forced along the burner body l through thepassage 7 extending longitudinally thereof.

The outer end of the burner body l-that is to say, the end at whichignitlon takes place, is recessed centrally as indicated at 8, thisrecess receiving a spring cup 9 ref. V,

movably mounted therein. Thev rear end or bottom of the spring cup 9 isperforated as.l indicated at 10 for the passage of oil into the cup.

lThe spring cup 9 receives a solid fluted plunger 11 bored lon'tudinally to provide a port 12 extending t roughout only a portion ofthe length of the lun er, lntersected by a lateral bore 13 in t e punger so that some of the oil entering the sprlng cup 9 through theopenings 10 thereln may be forced through the central port 12 and thencelaterally througlh the bore 13 to work along the outside of t e plungerto the end thereof where it enters slots 14 cut transversely across theouter end of the plunger as indicated in Fig. 4.

The outer end 15 of the burner body 1 surroundin the recess 8 is screwthreaded as indicated at 16 and receives a burner cap 17 which isprovided with a bore 18 through which'the oil is forced in the operatlonof the burner as will be understood. It 1s desirable to maintain theouter end of the plunger 11 in rm contact Withthe burner cap 17 and tothis end a coll sprlng 19 1s provided within the sprlng cup 9 betweenthe bottom of the cup and the lnner end of the lunger.

The outer end of the burner body and the parts just described carriedthereby constltute a burner head.

The exterior of the plunger 11 is fluted as indicated at 20 in Fig. 3and in Fig. 4 these flutings extend longitudinally of the plunger.

In operation, oil under pressure is forced alonglthe port 7 in theburner bod 1 entering t e ports or orifices 10 in the ottom of the sprlncu 9, travelling through this cup and a ong zetween the iutings 20 atthe exterior of the plunger 11 and through the port 12 in the centralpart of the plunger until it reaches the outer end of the plunger. Theyoil then passes alon the slots 14 in the outer face or end of the punger to the center thereof to finally discharge in a line atomizedcondition through the burner cap 1 When the burner ceases operation, theoil remaining in the head will drain back out of the head by gravity,toward the source of supply along the outside of plunger 11 and throughthecentral port 12 thereln and out through the orifices in the springcup 9 to the passage or port 7 in the main body l of the burner andhence the entire head of the burner will be freed of oil, and all dangerof carbonizing of oil therein and hence blocking of the small passa esor holes therein, due to'heat radiating rom the furnace, is eliminated.It is to be understood that changes may be made in the constructionabove described within the urview of my invention.

What I c aim is:

An oil burner of the mechanical type, comprising a stationary burnerbody, a lcup mounted in the outer end thereof, the cup facing the outerend of the burner body and having its bottom perforated adjoining thewall of the cup, a spring plunger mounted in said cup, said plungerbeing provided internally with a longitudinally extending oil passageWay and with a transverse oil passage way intercepting the saidlongitudinal passage Way, and externally with longitudinally extendingoil passageways com,- municating with the cup and with said transverseoil passage Way, a burner ca secured to the extreme end of the burnerody and engaging the spring plunger to retain the same in place in thesaid cup, said plunger being rovided with passage wags across the endtlereof for permitting of t e How of oil between the outer end of the iAugust, 1927.

.TALES N. MACRAE.

